/Engine/Source/Runtime/Engine/Classes/Particles/Rotation/ParticleModuleRotation.h
class UParticleModuleRotation : public [UParticleModuleRotationBase](API\Runtime\Engine\Particles\Rotation\UParticleModuleRotationBase)
FRawDistributio...
StartRotation
Initial rotation of the particle (1 = 360 degrees). The value is retrieved using the EmitterTime.